From the apprentice Lab 10.10 (maybe).
The requirements given are as follows.
However I have also added in a stack which grows up from the bottom of the memory. I have also added a call and return opcode and a memory dump opcode for debugging, and added instructions to implement a simplistic printing function.
| Instruction | Human Readable Description |
|---|---|
| 12xx | WRITE the Accumulator contents to stdout |
| 22xx | PUSH the Accumulator to the stack |
| 23xx | POP from stack to accumulator |
| 24xx | CALL subroutine at the memory location currently in the accumulator. The current programCounter is pushed to the stack |
| 25xx | RETurn from subroutine to the memory location popped from the stack. |
| 99xx | DUMP memory to stdout |
| 50xx | LOAD Literal xx into accumulator |
| 51xx | LOAD from Address in accumulator, into the accumulator |
- The
CALLandRETinstructions rely on theprogramCounterto be the next item in the stack. Each subroutine must therefore ensure that there is aPOPfor everyPUSHperformed. - The 100 words of memory are not used to hold the program code, there is a separate program memory for this.
The project uses cmake, so to make use:
> mkdir build
> cd build
> cmake ..
> makeTo run tests:
make testTo run as normal:
> ./src/simpletronTo enable debug messages run with debug as the argument
> ./src/simpletron debug 
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